IPNetwork is a set of utility classes for the .NET platform that take care of complex calculations related to networks, IP, netmask, CIDR, subnets, and supernets. It works with IPv4, has a light and clean API, and is fully unit tested.

TIPP is an IP planning application for network departments of organizations with medium- to large-sized networks. While providing all the necessary functions for keeping track of your IP and network allocations, it combines simplicity of design and use with a clean and thoroughly modern look and feel.

barcode2printer prints barcodes via a network printer by IP address using an image or PostScript file. Using jpeg2ps through the commandline, it converts a barcode JPEG image into a PostScript file and sends this file to a network printer using an IP and port.

ipclassify is a Linux user space application that blocks/marks connections from/to hosts based on lists specified in a configuration file. Currently, the block lists are in the format and obtained from iblocklist.com. If you are familiar with moblock then you know, essentially, what ipclassify is. The difference is that ipclassify can have multiple NFQUEUEs and is threaded (pthreads).

The goal of IP-Link is to show the relationships between different IP addresses from network traffic capture, thus quickly determining for a given address the IP address with which it communicates the most.